In the kingdom, we'll witness animals, that previously killed and ate each other, dwelling and lying down together.

We'll also witness trees where the leaves fade not, nor the fruit rot:

Isaiah 11:6 The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them.

  7 And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox.

Ezekiel 47:12a And by the river upon the bank thereof, on this side and on that side, shall grow all trees for meat, whose leaf shall not fade, neither shall the fruit thereof be consumed:

That will be amazing beyond measure to witness that!

Conversely, what must it have been like for Adam and Eve, after they sinned, and were put out of the garden?

They suddenly witnessed animals that had been in perfect peace together, now killing and eating each other.

Then they witnessed trees where the leaves would fade and the fruit rot.

How horrible was that to witness?